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ID = 57026
United States of America (USA)
Brand: Edison, Thomas A., North American Phonograph / National Phonograph; Orange, NJ
Tube type:  Relay in glass (not Relay Triode) 
Identical to 501-B2102

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 117 Volts
Description Thermal delay relay, 10s delay. SPST, normally open, 3A at 250V AC. 
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tdr8p~~6.png 501-B2102: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad

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